/Engine/Source/Runtime/Core/Public/Misc/PreloadableFile.h
Activate PreloadBytes mode by passing Flags::PreloadBytes to InitializeAsync. Activate PreloadHandle mode by passing Flags::PreloadHandle to InitializeAsync, optionally or'd with Flags::Prime.
class FPreloadableFile : public [FPreloadableArchive](API\Runtime\Core\Misc\FPreloadableArchive)